Q.1

One kg of sulphur requires 1 kg of oxygen for complete combustion and produces 2 kg of sulphur dioxide.

  • True
  • False
Q.2

Which of the following is the extensive property of a thermodynamic system?

  • Pressure
  • Volume
  • Temperature
  • Density
Q.3

Diesel cycle consists of __________ processes.

  • two constant volume and two isentropic
  • two constant pressure and two isentropic
  • two constant volume and two isothermal
  • one constant pressure, one constant volume and two isentropic
Q.4

The __________ is obtained when carbonisation of coal is carried out attoC.

  • soft coke
  • hard coke
  • pulverised coal
  • bituminous coal
Q.5

When a system changes its state from one equilibrium state to another equilibrium state, then the path of successive states through which the system has passed, is known as

  • thermodynamic law
  • thermodynamic process
  • thermodynamic cycle
  • none of these
Q.6

One molecule of oxygen is __________ times heavier than the hydrogen atom.

  • 12
  • 14
  • 16
  • 32
Q.7

High air-fuel ratio in gas turbines

  • increases power output
  • improves thermal efficiency
  • reduces exhaust temperature
  • do not damage turbine blades
Q.8

Steam coal is a

  • pulverised coal
  • brown coal
  • coking bituminous coal
  • non-coking bituminous coal
Q.9

The throttling process is an irreversible steady flow expansion process.

  • Correct
  • Incorrect
Q.10

According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.

  • first kind
  • second kind
Q.11

In closed cycle gas turbine, the air is compressed

  • isothermally
  • isentropically
  • polytropically
  • none of these
Q.12

The fuel mostly used in cement industry and in metallurgical processes is

  • wood charcoal
  • bituminous coke
  • pulverised coal
  • coke
Q.13

In closed cycle gas turbine, the air is compressed

  • isothermally
  • isentropically
  • polytropically
  • none of these
Q.14

Which of the following is the correct statement?

  • All the reversible engines have the same efficiency.
  • All the reversible and irreversible engines have the same efficiency.
  • Irreversible engines have maximum efficiency.
  • All engines are designed as reversible in order to obtain maximum efficiency.
Q.15

Petrol is distilled at

  • 65° to 220°C
  • 220° to 345°C
  • 345° to 470°C
  • 470° to 550°C
Q.16

The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as

  • enthalpy
  • internal energy
  • entropy
  • external energy
Q.17

First law of thermodynamics deals with

  • conservation of heat
  • conservation of momentum
  • conservation of mass
  • conservation of energy
Q.18

The amount of heat obtained by the complete combustion of 1 kg of a fuel when the products of its combustion are cooled down to the temperature of supplied air is called __________ calorific value offuel.

  • higher
  • lower
Q.19

Which of the following is a reversible non-flow process?

  • Isochoric process
  • Isobaric process
  • Hyperbolic process
  • all of these
Q.20

The change of entropy, when heat is absorbed by the gas, is

  • positive
  • negative
  • positive or negative
Q.21

The heat energy stored in the gas and used for raising the temperature of the gas is known as

  • external energy
  • internal energy
  • kinetic energy
  • molecular energy
Q.22

It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.

  • Correct
  • Incorrect
Q.23

When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called

  • wood charcoal
  • bituminous coal
  • briquetted coal
  • none of these
Q.24

The bomb calorimeter is used for finding the __________ calorific value of solid and liquid fuels.

  • higher
  • lower
Q.25

The amount of heat obtained by the complete combustion of 1 kg of a fuel when the products of its combustion are cooled down to the temperature of supplied air is called __________ calorific value offuel.

  • higher
  • lower
Q.26

The fuel mostly used in blast furnace for extracting pig iron from iron ores is

  • hard coke
  • soft coke
  • pulverised coal
  • bituminous coal
Q.27

When the finely ground coal is moulded under pressure with or without a binding material, the resulting fuel is called briquetted coal.

  • Yes
  • No
Q.28

The efficiency of the dual combustion cycle for the same compression ratio, is __________ Diesel cycle.

  • greater than
  • less than
  • equal to
Q.29

If the carbon content in the bituminous coal isto 81%, it is said to be coking bituminous coal.

  • Agree
  • Disagree
Q.30

Workdone during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)

  • all of these
0 h : 0 m : 1 s